A technique to actively reduce cryogenic pressure fluctuations
A device was designed and built to damp pressure fluctuations in a cryogenic system containing a superconducting radio frequency resonator cavity. The device uses an audio speaker to create pressure waves that travel into the system through an attached tube. The device was characterized in a few different configurations and many resulting trends were found. The device was operated in a range of 10 to 40 Hz and was able to create pressure fluctuations with amplitudes up to 2.09 Torr and resonant frequency shifts in the resonator cavity with a frequency oscillation amplitude of up to 30500 Hz depending on the configuration and settings used. The results indicated that the specific system and even the method of connection to a system had great effect on the frequency response of the device. The device was operated with a range of system pressure from 23.5 Torr to 1200 Torr, and the pressure was also shown to have an effect on the frequency response of the device.
Zhou, Purdue University.
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